BOXLIGHT ProjectoWrite2 User Manual page 89

Installation Guide for Window OS
4. Calibration
Step 3: Push the button on "Pointer" or "Light Pen" (pending on the
screen size), and point to the "Center of green cross target" from
upper-left of screen to lower-right of screen orderly. There are
nine targets totally. When there is no more green target on the
screen, it means you have completed the calibration procedure.
To ensure accurate positioning, keep the angle of "Pointer" or
"Light Pen" as consistent as possible during calibration.
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